Question

Exercise 5.71 < 9 of 10 > 1 Review Constants Periodic Table Part A The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is 2H+ (aq) + Zn(s) + H2(g) + Zn2+ (aq). When the zinc in a certain penny dissolves, the total volume of gas collected over water at 25°C was 0.949 L at a total pressure of 0.992 bar. What mass of hydrogen gas was collected? PO AXO A O O ? Submit Request Answer Provide Feedback Next >

Answer 1

Solution :-Given that:- Temperature(T) = 25*C or (273+ 25) => 298k cioc = 273 K volume = 0.949L Pressure = 0.99 2 bar or 0.97902 79 atm 1 atm = 1.01325 bar According to iclocil gas Haus PV = nRT or PV = n RT where P = Pressurel 0.9790299 atm) (volume) v= 0.9494 ; T (Temperature) = 298 K n (No. of moles) = ? Rieras constant) = 0.0821 L-atm.mogel kl Put all albore values in the equation - y = 0.9790279 atmx 0.949X 0-0821 Kicy mimorik x 2985 n=0.37975 mol molar mass of H₂ gas= 2.02g mol so mass of Hydrogen gas = 0.0379 75 mol x 2.02 g 1. not = 0.07670959 0.016 MH2 = 0.0 767 g (Ans) 0 = 0.076 70